Method of supporting and constructing concrete-floor sections



H. BAsMussEN. l METHOD 0F SUPPORTING AND CONSTRUCTING CONCRETE FLOIOR SECTIONS.

APPLICATION FILED IULY 18,1919:

Patented Mar. 30,1920.v I

Vof the left-hand portion of Fig. 1,

HANS RASMUSSEN, *OF* CHICAGO, ILLINOIS.

METHOD OF SUPPORTING ANI) CONSTRUCTING CONCRETE-FLOOR SECTIONS.

Specification of Letters Patent.

Patcntedlar. 30, 1920.

Application filed July 18, 1919.A Serial No. 311,806.

To all whom 'it may concern:

Be it known that I, HANS RAsMUssriN, a citizen ofthe United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new 'and useful Improvements in Methods of Supporting and Constructing Concrete-Floor Sections, of whichvthe following is a description, reference being had to the accompanying drawings, formingv a part of this specification, in which corresponding numerals of reference in the different figures indicate like parts.

The object of my invention is4 to provide a simple and effective method of and apparatus for supportingvconcrete floors Vduring construction with a view of dispensing with the usual complicated objectionable and eX pensive shoring heretofore employed yfor that purpose.

I accomplish said object in the manner hereinafter more particularly described and definitely set forth in' the claims z.

In the drawings,

Figure 1 isa'vertical section taken upon the line 1-1, Fig. 2, viewed in the direction of the arrow there shown, illustrating a section of floor as it would appear in process of construction, with my approved supporting means andv false-work,

F ig. 2, is a plan view thereof, and

Fig. 3, is a section corresponding to a part enlarged to better illustrate the anchoringfmembers and connections.

Referring tol the drawings,r 1, 1,. indicate the usual pillarsl adapted to support the meeting ends of I-beams or girders 2, which latter, usually, and in the example illustrated, are arranged at right-angles to each other and connected by means ofrplatesi2a, to'serve as supports for ordinary rectangular concrete floor sections. In order to support the forms for receiving the concrete in plastic condition, I

consist of I-beams 3, placed horizontally, and having a length corresponding substantially to the width of the floor-section to be formed. Each member 3 is supported at the respective ends'by means of vertical supporting members 4, the lower ends of which rest, in turn, upon the girders-2., Brace members 5, are rigidly connected with the. girder parts endete hold them securely in place.

A form. comprising aflat portion made up of. a floor. r6, corresponding in peripheral Aare preferably formed from members 8 and 7,

provide a plurality of truss-like form-supporting members which .or bottom 15, above each member. 13 vand ,securethemyin' place by means of like lagscrews 11 passed upwardlyv through the Vmembers 13 `and outline to, but somewhat smaller in area than that inclosed by the four girders 2, is secured to, and directly supported by transverse parallel floor joists 7, spaced apart; said joists being located in corresponding vertical planes with the Ibeams V3. Reinforcing timbers or bridging joists 8, of somewhat smaller cross-sectional area than that of the floor joists 7, are placed beneath the latter at right angles thereto. Suspending members 9, preferably made of wire loops,

yare connected at their upper ends by means of swiveled hooks 9a, with detachable clamps .10,y adapted to engage the lowermost flanges upon the I-beams 3.. The'lower end of each of said loops is arranged to partially encircle the body of an anchor-block 9b, better shown at the right in Fig. 3,'which blocks cast iron, the body being of substantially cylindrical form with a peripheral shoulder 9c partially surrounding it, beneath which the loopA is passed, thereby serving as an anchorage for said loop. The. anchor-blocks 9b are centrally and longitudinally bored andthreaded for the reception of lag-screwsill, which are projected upwardly through bores in the respectively, into said anchor-blocks, which latter are placed with their flat lower ends upon the iioor 6. Downwardly inclined stirrup members 12, are nailed or otherwise rigidly attached to-the ends of the iioor-joists 7 and are connected at their lower ends with horizontal support ing members 13. Lagging '14: is attached to the inner faces of the members 12 to form a troughlike or girder-boX portion arranged to partially inclose each of the four girders 2, the bottom of said troughs being` also provided with` lagging 15, secured'v to the horizontal members 13. The upper edges ofthe parts 14 are flush with the upper surface of .thefioor 6.

In order to supportthe girder-boxes, I place like anchor-'blocks 9b upon thelagging into said'bloclrs.4 A' wire loop l'is passed overI the top: of thegirder blocks', of which there aretwo for. each j v loop, 4placed beneath.. andy upon opposite: sides of the girder. 'loopsi for -1 each girder as bars or. members 13 tobe supported thereby.

rIhere shouldl be as many there are: crossiio Y lVhen the form is suspended in the manner indicated, it may be adjusted and leveled by means of the lag screws 11, or by twisting the wire in a well known way. Vhen so leveled, the concrete mixture 16, in plastic form, may be poured over the main loor 6 and into the girder boxes, thereby completely enveloping the several girders 2, as clearly shown at the right-hand in Fig.` 1. VThe usual metallic `reinforcing members or vrods 17, are embedded in the concrete. lVhen properly filled and leveled, the mass is allowed to set until suiiiciently hard to become self-sustaining, whereupon the forms may be removed and used in like manner in other locations upon the same or other floors.v o

The form for each square or floor section may be separated from those adjoining by merely removing the members 13 which connect them and support the members 15. When this is done the removal of the several lag-screws 11 permits the entire form of a given section to be lowered. The employment of the apparatus described enables the space beneath'a given floor to be entirely free from obstruction, whilev the truss-members 3 and suspending wires 9 do not interfere with the movements j of the workmen above.V

Having thus described my invention, I claim: f

1. The method of constructing concrete floor sections in conjunction with permanent floor-supporting girders, which consists in providing a form adapted to permit the molding of'plastic concrete in abutting contact with said girders to constitute a floorslab in they area between them, placing anchor-blocks in position upon said form lto* be ultimately and permanently embedded in the concrete structure, detachably projecting screws `from beneath through said form into said anchor-blocks, suspending said anchor-blocks to -rigid supports held by said girders above the level of theV floor- Vsection to bel molded, leveling `said form While so suspended, "filling the same with concrete, allowing said concrete to set and finally removing said form and suspending means. Y 1

2. The method of constructing concrete Hoor-sections in operative relation to floor- Vsupporting girders, whichV consists in providing a form to sustain a floor-section from beneath, locating anchor-blocks upon 4the upper face ofthe form in position lto be embedded in the concrete, detachably securing said anchor-blocks :from beneath the form, mounting truss-members upon said girders above the level of the latter, detachably connecting said `truss-members with said an- Chor-blocks by suspending means to su spend Y ,said form in predetermined relation `to said girders, filling said form with concrete,

allowing the same to set and iinally disconand from said truss supports respectively.

3. The method of constructing concrete floor sections in operative relation to floor supporting girders, which consists in providing a form having peripheral girderboxes to sustain a floor-section from beneath and permit the molding of the concrete to embed said girders therein, locating vanchorblocks upon the upper face of the iioor of the form and also within said girder boxes in position to be embedded in the concrete, detachably securing said anchor-blocks from beneath the form, mounting truss members upon said girders above the level of the latter, detachably connecting said truss members with the anchor blocks upon the floor of said form by suspending means, connecting the anchor-blocks in said girder boxes with said girders, filling saidV form and girder boxes with concrete to a predetermined level with respect to said girders allowing the same to. set and finally disconnecting said anchor-blocks from said form, and removing' said truss supports.i

el.. The method of constructing concrete floor-slabs between loor girders arranged to inclose a polygonal area, which consists in providing a form having a substantially flat middle portion and marginal trough-likede pressions formed to receive, but spaced apart from, said girders, suspending said form at a predeterminedv height with vrespect to that of said girders by means of superimposed trusses having suspending members infoperative connection with kanchor blocks detachably connected from beneath to the upper face of said forms on said middle portion, said trusses beingl arranged to bridge the space between while supported upon said girders, adjusting the height and level of said form, filling said form with plastic concrete, allowing the sameto set and finally removing said form and suspending members.

5. The combination with horizontally disposed girders arranged to inclose a polygonal space, of a form having a substantially fiat horizontal middle portion and marginal trough-like depressions formed to partially inclose but spaced apart from said girders, superimposed trusses .removably mounted upon and arranged to bridge the spacebetween parallel girders, suspending members secured to said trusses, anchor-blocks upon said 'form secured to said suspendingmembers and screws extending` upwardly Vfrom beneath said form Vand threaded intoV said anchor-blocks.

a plurality of removable trusses having their endsmounted upon vand supported by said girders, suspending means depending from said trusses, a form for molding a concrete slab between and in contact with said floorgirders, anchor blocks upon said form in operative connection with said suspending means, anchor-blocks and independent screw adjusting means in operative connection with each of said anchor-blocks for separately adjusting the height of the several portions of said form.

7. An apparatus for forming l concrete floor sections in conjunction with floor-supporting girders, comprising, in combination, a plurality of removable superimposed trusses arranged to bridge the space between parallel girders, a plurality of vertical suspending members depending from each ofV said trusses, a form kfor molding a Concrete slab between 4and in conjunction with said girders, anchor-blocks upon said form in operative connection with said suspending members and lag-screws projected Jfrom beneath through said form into said anchorblocks.

n testimony whereof I have signed this specification in the presence of two subscribing witnesses, this l2 day of July, 1919.

HANS RASMUSSEN.

itnessesz W. HARDING, HARRY I. CROMER. 

